Work in progres, please take a look and give early feedback if this is the way we want to structure…

samples/myapi/generated/dart/struct.dart

-// Copyright (c) 2015, the Fletch project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE.md file.
-
-library struct;
-
-import "dart:ffi";
-
-Reader getRoot(Reader reader, Foreign request) {
-  int segments = request.getInt32(40);
-  if (segments == 0) {
-    MessageReader messageReader = new MessageReader();
-    Segment segment = new Segment(messageReader, request);
-    messageReader.segments.add(segment);
-    reader._segment = segment;
-    reader._offset = 48;
-    return reader;
-  } else {
-    return getSegmentedRoot(reader, request, segments);
-  }
-}
-
-Reader getSegmentedRoot(Reader reader, Foreign request, int segments) {
-  MessageReader messageReader = new MessageReader();
-  int offset = 56;
-  for (int i = 0; i < segments; i++) {
-    int address = (Foreign.bitsPerMachineWord == 32)
-        ? request.getUint32(offset)
-        : request.getUint64(offset);
-    int size = request.getInt32(offset + 8);
-    Foreign memory = new Foreign.fromAddress(address, size);
-    Segment segment = new Segment(messageReader, memory);
-    messageReader.segments.add(segment);
-    offset += 16;
-  }
-  reader._segment = messageReader.segments.first;
-  reader._offset = 48;
-  return reader;
-}
-
-int getResultMessage(Builder builder) {
-  BuilderSegment segment = builder._segment;
-  if (segment._next == null) {
-    // Mark result as being non-segmented.
-    Foreign memory = segment.memory;
-    memory.setInt32(0, 0);
-    memory.setInt32(4, memory.length);
-    return memory.value;
-  }
-
-  // The result is a segmented message. Build a memory block that
-  // contains the addresses and sizes of all of them.
-  int segments = segment._builder._segments;
-  int size = 8 + (segments * 16);
-  Foreign buffer = new Foreign.allocated(size);
-  // Mark the result as being segmented.
-  buffer.setInt32(0, segments);
-  int offset = 8;
-  do {
-    buffer.setInt64(offset, segment.memory.value);
-    buffer.setInt32(offset + 8, segment._used);
-    segment = segment._next;
-    offset += 16;
-  } while (segment != null);
-  return buffer.value;
-}
-
-class MessageReader {
-  final List<Segment> segments = [];
-  MessageReader();
-
-  Segment getSegment(int id) => segments[id];
-}
-
-class Segment {
-  final MessageReader reader;
-  final Foreign memory;
-  Segment(this.reader, this.memory);
-}
-
-class Reader {
-  Segment _segment;
-  int _offset;
-
-  Segment get segment => _segment;
-  void set segment(Segment value) {
-    _segment = value;
-  }
-
-  int get offset => _offset;
-  void set offset(int value) {
-    _offset = value;
-  }
-
-  readStruct(Reader reader, int offset) {
-    Segment segment = _segment;
-    offset += _offset;
-    while (true) {
-      Foreign memory = segment.memory;
-      int lo = memory.getInt32(offset + 0);
-      int hi = memory.getInt32(offset + 4);
-      int tag = lo & 3;
-      if (tag == 0) {
-        throw new UnimplementedError("Cannot read uninitialized structs");
-      } else if (tag == 1) {
-        reader._segment = segment;
-        reader._offset = lo >> 2;
-        return reader;
-      } else {
-        segment = segment.reader.getSegment(hi);
-        offset = lo >> 2;
-      }
-    }
-  }
-
-  readList(ListReader reader, int offset) {
-    Segment segment = _segment;
-    offset += _offset;
-    while (true) {
-      Foreign memory = segment.memory;
-      int lo = memory.getInt32(offset + 0);
-      int hi = memory.getInt32(offset + 4);
-      int tag = lo & 3;
-      if (tag == 0) {
-        // If the list hasn't been initialized, then
-        // we return an empty list.
-        reader._length = 0;
-        return reader;
-      } else if (tag == 2) {
-        reader._segment = segment;
-        reader._offset = lo >> 2;
-        reader._length = hi;
-        return reader;
-      } else {
-        segment = segment.reader.getSegment(hi);
-        offset = lo >> 2;
-      }
-    }
-  }
-
-  String readString(ListReader reader, int offset) {
-    List<int> charCodes = readList(reader, offset);
-    return new String.fromCharCodes(charCodes);
-  }
-}
-
-class ListReader extends Reader {
-  int _length;
-  int get length => _length;
-
-  readListElement(Reader reader, int index, int size) {
-    reader._segment = _segment;
-    reader._offset = _offset + index * size;
-    return reader;
-  }
-
-  // TODO(zerny): Move this to a mixin base.
-  Iterator get iterator { throw new UnsupportedError("ListBuilder::iterator"); }
-  Iterable map(Function f) { throw new UnsupportedError("ListBuilder::map"); }
-  Iterable where(Function test) { throw new UnsupportedError("ListBuilder::where"); }
-  Iterable expand(Function f) { throw new UnsupportedError("ListBuilder::expand"); }
-  bool contains(Object element) { throw new UnsupportedError("ListBuilder::contains"); }
-  void forEach(Function f) { throw new UnsupportedError("ListBuilder::forEach"); }
-  reduce(Function combine) { throw new UnsupportedError("ListBuilder::reduce"); }
-  dynamic fold(init, Function combine) { throw new UnsupportedError("ListBuilder::fold"); }
-  bool every(Function test) { throw new UnsupportedError("ListBuilder::every"); }
-  String join([String separator = ""]) { throw new UnsupportedError("ListBuilder::join"); }
-  bool any(Function test) { throw new UnsupportedError("ListBuilder::any"); }
-  List toList({ bool growable: true }) { throw new UnsupportedError("ListBuilder::toList"); }
-  Set toSet() { throw new UnsupportedError("ListBuilder::toSet"); }
-  bool get isEmpty { throw new UnsupportedError("ListBuilder::isEmpty"); }
-  bool get isNotEmpty { throw new UnsupportedError("ListBuilder::isNotEmpty"); }
-  Iterable take(int count) { throw new UnsupportedError("ListBuilder::take"); }
-  Iterable takeWhile(Function test) { throw new UnsupportedError("ListBuilder::takeWhile"); }
-  Iterable skip(int count) { throw new UnsupportedError("ListBuilder::skip"); }
-  Iterable skipWhile(Function test) { throw new UnsupportedError("ListBuilder::skipWhile"); }
-  get first { throw new UnsupportedError("ListBuilder::first"); }
-  get last { throw new UnsupportedError("ListBuilder::last"); }
-  get single { throw new UnsupportedError("ListBuilder::single"); }
-  firstWhere(Function test, { orElse() }) { throw new UnsupportedError("ListBuilder::firstWhere"); }
-  lastWhere(Function test, { orElse() }) { throw new UnsupportedError("ListBuilder::lastWhere"); }
-  singleWhere(Function test) { throw new UnsupportedError("ListBuilder::singleWhere"); }
-  elementAt(int index) { throw new UnsupportedError("ListBuilder::elementAt"); }
-  void operator []=(int index, value) { throw new UnsupportedError("ListBuilder::operator []="); }
-  void set length(int newLength) { throw new UnsupportedError("ListBuilder::set"); }
-  void add(value) { throw new UnsupportedError("ListBuilder::add"); }
-  void addAll(Iterable iterable) { throw new UnsupportedError("ListBuilder::addAll"); }
-  Iterable get reversed { throw new UnsupportedError("ListBuilder::reversed"); }
-  void sort([int compare(a, b)]) { throw new UnsupportedError("ListBuilder::sort"); }
-  void shuffle([random]) { throw new UnsupportedError("ListBuilder::shuffle"); }
-  int indexOf(element, [int start = 0]) { throw new UnsupportedError("ListBuilder::indexOf"); }
-  int lastIndexOf(element, [int start]) { throw new UnsupportedError("ListBuilder::lastIndexOf"); }
-  void clear() { throw new UnsupportedError("ListBuilder::clear"); }
-  void insert(int index, element) { throw new UnsupportedError("ListBuilder::insert"); }
-  void insertAll(int index, Iterable iterable) { throw new UnsupportedError("ListBuilder::insertAll"); }
-  void setAll(int index, Iterable iterable) { throw new UnsupportedError("ListBuilder::setAll"); }
-  bool remove(Object value) { throw new UnsupportedError("ListBuilder::remove"); }
-  removeAt(int index) { throw new UnsupportedError("ListBuilder::removeAt"); }
-  removeLast() { throw new UnsupportedError("ListBuilder::removeLast"); }
-  void removeWhere(Function test) { throw new UnsupportedError("ListBuilder::removeWhere"); }
-  void retainWhere(Function test) { throw new UnsupportedError("ListBuilder::retainWhere"); }
-  List sublist(int start, [int end]) { throw new UnsupportedError("ListBuilder::sublist"); }
-  Iterable getRange(int start, int end) { throw new UnsupportedError("ListBuilder::getRange"); }
-  void setRange(int start, int end, Iterable iterable, [int skipCount = 0]) { throw new UnsupportedError("ListBuilder::setRange"); }
-  void removeRange(int start, int end) { throw new UnsupportedError("ListBuilder::removeRange"); }
-  void fillRange(int start, int end, [fillValue]) { throw new UnsupportedError("ListBuilder::fillRange"); }
-  void replaceRange(int start, int end, Iterable replacement) { throw new UnsupportedError("ListBuilder::replaceRange"); }
-  Map asMap() { throw new UnsupportedError("ListBuilder::asMap"); }
-}
-
-class BuilderSegment {
-  final MessageBuilder _builder;
-  final Foreign memory;
-  int _id;
-  int _used = 0;
-  BuilderSegment _next;
-
-  BuilderSegment(this._builder, this._id, int space)
-      : memory = new Foreign.allocated(space);
-
-  bool HasSpaceForBytes(int bytes) => _used + bytes <= memory.length;
-
-  int Allocate(int bytes) {
-    if (!HasSpaceForBytes(bytes)) return -1;
-    var result = _used;
-    _used += bytes;
-    return result;
-  }
-}
-
-class MessageBuilder {
-  BuilderSegment _first;
-  BuilderSegment _last;
-  int _segments = 1;
-
-  MessageBuilder(int space) {
-    _first = new BuilderSegment(this, 0, space);
-    _last = _first;
-  }
-
-  Builder initRoot(Builder builder, int size) {
-    int offset = _first.Allocate(8 + size);
-    builder._segment = _first;
-    builder._offset = offset + 8;
-    return builder;
-  }
-
-  BuilderSegment FindSegmentForBytes(int bytes) {
-    if (_last.HasSpaceForBytes(bytes)) return _last;
-    int capacity = (bytes > 8192) ? bytes : 8192;
-    BuilderSegment segment = new BuilderSegment(this, _segments++, capacity);
-    _last._next = segment;
-    _last = segment;
-    return segment;
-  }
-}
-
-class Builder {
-  BuilderSegment _segment;
-  int _offset;
-
-  Segment get segment => _segment;
-  void set segment(Segment value) {
-    _segment = value;
-  }
-
-  int get offset => _offset;
-  void set offset(int value) {
-    _offset = value;
-  }
-
-  Builder NewStruct(Builder builder, int offset, int size) {
-    offset += _offset;
-    BuilderSegment segment = _segment;
-    while (true) {
-      int result = segment.Allocate(size);
-      Foreign memory = segment.memory;
-      if (result >= 0) {
-        memory.setInt32(offset + 0, (result << 2) | 1);
-        memory.setInt32(offset + 4, 0);
-        builder._segment = segment;
-        builder._offset = result;
-        return builder;
-      }
-
-      BuilderSegment other = segment._builder.FindSegmentForBytes(size + 8);
-      int target = other.Allocate(8);
-      memory.setInt32(offset + 0, (target << 2) | 3);
-      memory.setInt32(offset + 4, other._id);
-
-      segment = other;
-      offset = target;
-    }
-  }
-
-  ListBuilder NewList(ListBuilder list,
-                      int offset,
-                      int length,
-                      int size) {
-    list._length = length;
-    offset += _offset;
-    size *= length;
-    BuilderSegment segment = _segment;
-    while (true) {
-      int result = segment.Allocate(size);
-      Foreign memory = segment.memory;
-      if (result >= 0) {
-        memory.setInt32(offset + 0, (result << 2) | 1);
-        memory.setInt32(offset + 4, length);
-        list._segment = segment;
-        list._offset = result;
-        return list;
-      }
-
-      BuilderSegment other = segment._builder.FindSegmentForBytes(size + 8);
-      int target = other.Allocate(8);
-      memory.setInt32(offset + 0, (target << 2) | 3);
-      memory.setInt32(offset + 4, other._id);
-
-      segment = other;
-      offset = target;
-    }
-  }
-
-  void NewString(ListBuilder list, int offset, String value) {
-    NewList(list, offset, value.length, 2);
-    for (int i = 0; i < value.length; i++) {
-      list[i] = value.codeUnitAt(i);
-    }
-  }
-}
-
-class ListBuilder extends Builder {
-  int _length;
-  int get length => _length;
-
-  readListElement(Builder builder, int index, int size) {
-    builder._segment = _segment;
-    builder._offset = _offset + index * size;
-    return builder;
-  }
-
-  // TODO(zerny): Move this to a mixin base.
-  Iterator get iterator { throw new UnsupportedError("ListBuilder::iterator"); }
-  Iterable map(Function f) { throw new UnsupportedError("ListBuilder::map"); }
-  Iterable where(Function test) { throw new UnsupportedError("ListBuilder::where"); }
-  Iterable expand(Function f) { throw new UnsupportedError("ListBuilder::expand"); }
-  bool contains(Object element) { throw new UnsupportedError("ListBuilder::contains"); }
-  void forEach(Function f) { throw new UnsupportedError("ListBuilder::forEach"); }
-  reduce(Function combine) { throw new UnsupportedError("ListBuilder::reduce"); }
-  dynamic fold(init, Function combine) { throw new UnsupportedError("ListBuilder::fold"); }
-  bool every(Function test) { throw new UnsupportedError("ListBuilder::every"); }
-  String join([String separator = ""]) { throw new UnsupportedError("ListBuilder::join"); }
-  bool any(Function test) { throw new UnsupportedError("ListBuilder::any"); }
-  List toList({ bool growable: true }) { throw new UnsupportedError("ListBuilder::toList"); }
-  Set toSet() { throw new UnsupportedError("ListBuilder::toSet"); }
-  bool get isEmpty { throw new UnsupportedError("ListBuilder::isEmpty"); }
-  bool get isNotEmpty { throw new UnsupportedError("ListBuilder::isNotEmpty"); }
-  Iterable take(int count) { throw new UnsupportedError("ListBuilder::take"); }
-  Iterable takeWhile(Function test) { throw new UnsupportedError("ListBuilder::takeWhile"); }
-  Iterable skip(int count) { throw new UnsupportedError("ListBuilder::skip"); }
-  Iterable skipWhile(Function test) { throw new UnsupportedError("ListBuilder::skipWhile"); }
-  get first { throw new UnsupportedError("ListBuilder::first"); }
-  get last { throw new UnsupportedError("ListBuilder::last"); }
-  get single { throw new UnsupportedError("ListBuilder::single"); }
-  firstWhere(Function test, { orElse() }) { throw new UnsupportedError("ListBuilder::firstWhere"); }
-  lastWhere(Function test, { orElse() }) { throw new UnsupportedError("ListBuilder::lastWhere"); }
-  singleWhere(Function test) { throw new UnsupportedError("ListBuilder::singleWhere"); }
-  elementAt(int index) { throw new UnsupportedError("ListBuilder::elementAt"); }
-  void operator []=(int index, value) { throw new UnsupportedError("ListBuilder::operator []="); }
-  void set length(int newLength) { throw new UnsupportedError("ListBuilder::set"); }
-  void add(value) { throw new UnsupportedError("ListBuilder::add"); }
-  void addAll(Iterable iterable) { throw new UnsupportedError("ListBuilder::addAll"); }
-  Iterable get reversed { throw new UnsupportedError("ListBuilder::reversed"); }
-  void sort([int compare(a, b)]) { throw new UnsupportedError("ListBuilder::sort"); }
-  void shuffle([random]) { throw new UnsupportedError("ListBuilder::shuffle"); }
-  int indexOf(element, [int start = 0]) { throw new UnsupportedError("ListBuilder::indexOf"); }
-  int lastIndexOf(element, [int start]) { throw new UnsupportedError("ListBuilder::lastIndexOf"); }
-  void clear() { throw new UnsupportedError("ListBuilder::clear"); }
-  void insert(int index, element) { throw new UnsupportedError("ListBuilder::insert"); }
-  void insertAll(int index, Iterable iterable) { throw new UnsupportedError("ListBuilder::insertAll"); }
-  void setAll(int index, Iterable iterable) { throw new UnsupportedError("ListBuilder::setAll"); }
-  bool remove(Object value) { throw new UnsupportedError("ListBuilder::remove"); }
-  removeAt(int index) { throw new UnsupportedError("ListBuilder::removeAt"); }
-  removeLast() { throw new UnsupportedError("ListBuilder::removeLast"); }
-  void removeWhere(Function test) { throw new UnsupportedError("ListBuilder::removeWhere"); }
-  void retainWhere(Function test) { throw new UnsupportedError("ListBuilder::retainWhere"); }
-  List sublist(int start, [int end]) { throw new UnsupportedError("ListBuilder::sublist"); }
-  Iterable getRange(int start, int end) { throw new UnsupportedError("ListBuilder::getRange"); }
-  void setRange(int start, int end, Iterable iterable, [int skipCount = 0]) { throw new UnsupportedError("ListBuilder::setRange"); }
-  void removeRange(int start, int end) { throw new UnsupportedError("ListBuilder::removeRange"); }
-  void fillRange(int start, int end, [fillValue]) { throw new UnsupportedError("ListBuilder::fillRange"); }
-  void replaceRange(int start, int end, Iterable replacement) { throw new UnsupportedError("ListBuilder::replaceRange"); }
-  Map asMap() { throw new UnsupportedError("ListBuilder::asMap"); }
-}